V-Shaped Vacuum Compensation Elements in Plastic Containers
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Solution Overview
Problem
Conventional plastic containers for perishable products often deform or collapse under internal vacuum conditions created during the hot-filling process, leading to structural issues and stress concentrations, particularly at corners and outside areas of rectangular vacuum panels.
Innovation Solution
The design incorporates a sidewall with circumferentially spaced, V-shaped vacuum compensation elements comprising nested fields and ridges, which provide enhanced support and flexibility to prevent deformation, allowing the container to maintain its shape and structure during hot-filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rectangular vacuum panels are used in the container sidewall, then the container can withstand internal vacuum conditions, but high stress areas and deformation occur at the corners and outside areas of the panels
Solution Approach 1:
The patent replaces conventional rectangular vacuum panels with V-shaped vacuum compensation elements that have curved surfaces. The V-shape configuration with rounded corners eliminates the sharp angles that cause stress concentration, allowing the panels to flex inward uniformly under vacuum conditions without creating high stress areas at corners or edges.
2Weight of moving object
If the container is designed to be lightweight, then material usage is reduced, but the container may deform or collapse under internal vacuum conditions
Solution Approach 1:
The patent employs V-shaped vacuum compensation elements that are inherently flexible, allowing them to deform inward under vacuum pressure without compromising the overall structural integrity of the container. This flexibility enables the use of lighter materials while maintaining the ability to withstand internal vacuum conditions, as the V-shaped panels can accommodate pressure changes without requiring heavy reinforcement.
3Shape
If vacuum panels are located about the circumference and covered by a label, then the container maintains a clean appearance, but the panels and posts are hidden and cannot be accessed
Solution Approach 1:
The patent positions the V-shaped vacuum compensation elements asymmetrically on the container sidewall, specifically locating them in areas that are naturally less visible or less frequently accessed. This asymmetric placement allows the label to cover or minimize the visual impact of the panels while still providing structural functionality, and simultaneously ensures that the panels remain accessible for maintenance or inspection when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents deformation and stress concentrations, enabling the container to withstand hot-filling conditions while maintaining a lightweight and aesthetically appealing design, with the option to function as a label-less gripping surface.
Implementation Method 1
the contents of the container contract upon cooling, which creates a vacuum condition inside the container
Implementation Method 2
The vacuum panels are configured to inwardly and easily flex in response to internal vacuum
Data Source
AI summary
A lightweight container includes an enclosed base, an upper portion that extends upwardly to a finish; and a body located between the base and the upper portion. The sidewall includes vacuum compensation elements that have an open end and an opposing closed end, and that form a V-shape. Each element has nested fields.